Planer-clamp



C. SCHWARZ. PLANER CLAMP.

APPLICATION FILED JAN. 1. I926.

Patented Mar. 22; 1921.

3 SHEETS-SHEET I.

hrifiowazy f C. SCHWARZ.

PLANER CLAMP.

APPLICATION FILED JAN. 7, 1920. 1,372,459. Patented Mar. 22,1921.

3 SHEETS-SHEET 2.

1 1 A @rifiafiw g C. SCHWARZ.

PLANER CLAMP. APPLICATION FILED JANQI. 1920.

1,372,459. Patented Mar. 22,1921.

3 SHIETS-SHEET 3- Invaafir of which the following is a specification. i

removed therefrom when the machining op- UNITEDSTATEIS PATENT OFFICE.

CARL sorrwanz, or rHrLAnnLPrIIA, PENNSYLVANIA.

To all coho m, it may concern Be it known that I, CARL ScHwAnz, was

zen of the United States, residing atPhiladelphia, in the county ofPhiladelphia and State. of Pennsylvania, have invented new and usefulImprovements in Planer-Clamps,

My invention relates to a newand useful improvement in clampingdevicesfor bold ing work upon the beds of planers, shapers or other machinetools, and has for its ob ject to provide an exceedingly simple andeffective device which maybe readilyse cured to the bed of aplaner orthe like by means of which the work to be machined may:

befirmly clamped to said bed and readily eration has been completed. 1

A further object of my invention is to so construct a clamp 'ofthisdescription that it will force the article to be machined downward uponthe machine bed during the process of clamping the article.

A still further objectJof my invention is to provide for setting theclamping bars againstback lash after they have been adjusted to thework. it i With these ends in view, this invention consists in thedetails of construction and combination of. 1 elements hereinafter setforth and then specifically designated by the claims. i i In order thatthose skllledin the art to which this invention appertains may understand how to make and use the same, I Wlll describe its construction indetail, referring by numerals to the accompanying drawings forming apart of this application in which y Figure 1, is a plan view of a clampmade in accordance with my improvement.

Fig. 2, is a cross section of Fig. 1 to clearly show the constructionthereof.

Fig. 3, is a plan View of a portion of a planer bed showing four of myimproved clamps secured thereon in position to clamp an article uponsaid bed for machining.

Fig. 4:, is a side elevation of a portion of Fig. 5, is a portion of aplaner bed show ing four of my improved clamps secured thereon in suchmanner as to adapt them for clamping a narrow thin piece of metal forplaning. i

Fig. 6, is an end view of F g. 5. In carrying out my invention as hereemrLanEn-cLAMr.

Specification of Letters Patent.

Applicatiodfiled January 7, 1920. Serial No 349,919.

Patented Mar. 22, 1921 bodied 1 represents the base of the clamphavingan inclined section 2 formed there with 1n which is guided the clamp bar3 the latter carrying a threaded shank 4.. This clamp bar is held inplace upon the inclined section by the cap plate secured in place by thebolts 6. a i a 7 represents a barrel which isinternally threaded toreceive the threaded shank a and this barrel carries a collar 8 and alsohas formed therewith the wrench hold 9.

10 represents a plate through. which the body of the barrel passes andis adapted to revolve thereinthestationary collar 8 bean plate 5 bymeans of the bolts 14:. From this description it will be. seen that theclamp bar 3 may be forced forward or retracted by applying a wrench tothe wrench hold 9 and revolving the barrel in the desired direction theforwardend of the clampbar being bev eledso as to form arelatively thinnose 15 forcontact with the objectlto be clamped upon a machine toolbed. a In practice two or more of these clamps are secured upon themachine bed as shown 1n Flgs. 3 and l and indlcated at a. Two

of these clamps are set opposite each other crosswise of the planer bed16 while two other such clamps are set opposite each other lengthwise ofthe bed as indicated at?) and when so placed the article to be clampedto the bed for machining is placed between this clamp and the clamp barsof the latter are set up as before described until the noses thereofbind against the article and force it downward firmly against the bedplate while holding it against longitudinal and lateral movement.

When. the machining operation has been completed a slightturningbackward of the barrel of one of each set of the clamps willsufficiently free the noses of these particular clamps from the work topermit it to be re.- moved. This will greatly facilitate the handling ofduplicate pieces which are to be 1 machined since the clamps do not haveto be unset, and the positioning of the work upon the bed, and theclamping of the same thereto is greatly facilitated as each piece ofwork will be placed in the same position without calculation orresetting the tools for the adjustment of the planer.

My improved clamp is especially adapted for use in holding narrow thinpieces of metal upon theplaner bedand the arrangement of the clampforthis class of work is shown in igs. 5 and 6 in whi'ch two pairs a ofclamps are set opposite each other cross- I wise'fof the bed asindicated at 0 and a.

When the clamps are thus disposed a strip of metal such as indicated at17 isreadily clamped to the planer bed and securely held against thelongitudinal or sidewise movement while being machined with theadvantage of permitting the machining'of the entire upper surface of thestrip without re- 7 setting which has heretofore been necessary whereordinary clamps are used for holding the work in place. The bevel nosesof the clamp bars prevent the interference of these clampbars with thetool for machining the Work as will bereadily understood.

The base of each of the clamps is secured I to the planer bed by meansof the bolts 18 or in any other convenient manner.

19 represents a set bolt which is threaded through the cap plate '5 andthe end of which passes into the depression 20 formed with the upperface of the clamp bar 3 longitudinally thereof and the purpose of thisarrangement is to hold the clamp bar against retraction by vibration orjar when the nose 1 thereof has been set against the work which V isreadily accomplished by screwing down the exact details of constructionas herein shown as these may be varied within the limits of the appendedclaims without departing from the spirit of my invention.

- Having thus fully described my invention, what I claim as new anduseful is 1. A clamp comprising a base, an inclined section carriedbycsaid base, a clamp bar fitted to slide upon said inclined section,said clamp bar having a lon itudinal depression in the upper facethereof, a cap plate secured upon the inclined section so as to hold theclamp bar in place, a set bolt threaded through said cap plate the noseof said bolt entering said depression, and means for moving the clampbar back and forth. 2. A clamp comprising a base, an inclined sectioncarried by said base, a clamp bar fitted to slide upon said inclinedsection, said clamp bar having a longitudinal depression in the upperface thereof, a cap plate secured upon the inclined section so as tohold the clamp bar in place, a set bolt threaded through said cap platethe nose of said bolt entering said depression, a threaded shank formedwith the clamp bar, and an internally threaded barrel into which saidshank passes.

3. A clamp of the character described consisting of a base, an inclinedsection carried by said base, a clamp bar fitted to slide upon saidinclined section, a cap plate secured upon said section for holding theclamp bar in position a threaded shank formed with the clamp bar, abarrel threaded upon said shank, a stationary collar formed with saidbarrel, a removable collar secured upon said barrel, a plate secured tothe rearof the inclined section against which said collar bears, and'awrench hold formed with the barrel for actuating the device.

In testimony whereof, I have hereunto afiixed' my signature.

CARL SCHWARZ.

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